Does Android need an interface redesign ?

Most of the other operating systems get their interface redesigned every other version. For example, Windows Phone 8 allows users to change the size of the live tiles, and Symbian Belle doesn't look at all like the previous version of Symbian. I have noticed that Android versions have very few design changes from one version to another. The user interface is only customized by the phone manufacturers that choose Android OS.

Do you think Android needs to change its user interface in a more striking manner, or is it best to just improve the features and work less on the design?